NGWS SDK Documentation  

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Compiler Error C3133

'attribute_name(s)' : these attributes are only used within the context of a COM interface

The following attributes:

are only valid within the context of an interface preceded with one of the following attributes:

For example:

__interface IX11 {
   [ property, id(1), helpstring("Help!") ]   // id and helpstring not valid on property
   int Size;
};